Wednesday, October 6th 2021

AMD Processors Lose 15% Gaming Performance with Windows 11, L3 Cache Latency Tripled

Apparently, AMD processors officially compatible with Windows 11, exhibit a three-times increase in L3 cache latency with the new operating system. The new operating system is also found to break the "preferred cores" system on AMD processors (UEFI CPPC2), in which the two "best" CPU cores, which can sustain the highest boost frequencies, are highlighted to the operating system, so most of the light-threaded traffic could be sent to them.

AMD and Microsoft jointly made this discovery, and listed out potential impact on application performance. The increased L3 cache latency affects performance of applications sensitive to memory performance. They also warn of a 10-15% loss in gaming performance. On the other hand, a dysfunctional "preferred cores" system would mean reduced performance in light-threaded tasks as the OS is unaware which are the processor's two best cores. Thankfully, both issues can be fixed via software updates, and AMD is working with Microsoft to push fixes for both issues through Windows Update, in an update rollout scheduled within October 2021.
Source: AMD
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141 Comments on AMD Processors Lose 15% Gaming Performance with Windows 11, L3 Cache Latency Tripled

#126
Why_Me
TiggerCan we have a Intel/Microsoft conspiracy theory thread instead of crapping it all in here.
I thought most every thread in this forum was about a MS, Intel, Nvidia cabal out to get AMD conspiracy theory.
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#127
InhaleOblivion
This is why I always take a wait and see approach to new tech, especially OSes. Nothing new really, should be resolved eventually.
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#129
GURU7OF9
R-T-BI mean the fix comes out before alder lake launch if you guys would read the article. I know, that's painful, but it might break your conspiracy worries down before they begin, and that's a good thing, right?
Well we shall see if that actually occurs ?
For benchmarks with win11 and alder lake, what will they compare it to if it doesn't?
Still do w11 anyway?
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#130
R-T-B
GURU7OF9Well we shall see if that actually occurs ?
Already happened in dev branch.
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#131
Patriot
Why_MeI thought most every thread in this forum was about a MS, Intel, Nvidia cabal out to get AMD conspiracy theory.
That's just history not a conspiracy. Dev branch had the fix before they pushed broken to rtm. Its staying in dev longer than normal... Alders lake launching on the 4th will be hitting reviewers soon. Even if the patch is released before the 4th it could easily taint launch benchmarks. The only theory is that this was purposeful rather than incompetence and that simply requires time to see if it plays out.

Those laughing and being dismissive are clearly ignorant of the past and eager for it to repeat.
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#132
R-T-B
PatriotThat's just history not a conspiracy. Dev branch had the fix before they pushed broken to rtm. Its staying in dev longer than normal... Alders lake launching on the 4th will be hitting reviewers soon. Even if the patch is released before the 4th it could easily taint launch benchmarks. The only theory is that this was purposeful rather than incompetence and that simply requires time to see if it plays out.

Those laughing and being dismissive are clearly ignorant of the past and eager for it to repeat.
I think those that think this is a conspiracy that will go over reviewers heads really don't have faith in their hardware reviewers.
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#133
Patriot
R-T-BI think those that think this is a conspiracy that will go over reviewers heads really don't have faith in their hardware reviewers.
For the most part, those reviewers have already been hired by Intel. Shrout and company. I would say most of the serious review sites will be fine, its the influencers on YouTube that don't have the experience or expertise that are vulnerable. This has the potential to cause issues and allow Intel marketing to make specific claims... But I think the tech reviewers have grown tired of being manipulated in general. Publishing review guides, calling amd Nvidia and Intel out when called for. That doesn't mean an effort won't be made.

Like I said, wait and see. I see incompetence more than malice, but history makes me wary.
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#134
R-T-B
PatriotFor the most part, those reviewers have already been hired by Intel.
I'd advise you to find better reviewers.

That's not to say that buying reviewers is not an issue, but the best way to fight it is to stop giving shills of any type credibility and air time.
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#135
Patriot
R-T-BI'd advise you to find better reviewers.

That's not to say that buying reviewers is not an issue, but the best way to fight it is to stop giving shills of any type credibility and air time.
Literally hired not bribed. After shrout got caught red handed he ended up working for Intel.

Anand tpu gn and sth are my mainstays. Not sure where I would go from there...
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#136
R-T-B
Yeah, I hear you. It's hard wanting a decent review but we have to keep supporting those that do it right.
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#137
Patriot
R-T-BYeah, I hear you. It's hard wanting a decent review but we have to keep supporting those that do it right.
(raises cup to the Wiz)

Edited, potentially after thumbsup:
I actually am looking forward to alders lake and hope it brings competition... just don't like any shady business.... be it Intel paying Shrout research for SSD reviews, Chiller hyperclocked cpu, Zen2 Turbo clocks or Nvidia review guides.
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#138
R-T-B
Patriot(raises cup to the Wiz)

Edited, potentially after thumbsup:
I actually am looking forward to alders lake and hope it brings competition... just don't like any shady business.... be it Intel paying Shrout research for SSD reviews, Chiller hyperclocked cpu, Zen2 Turbo clocks or Nvidia review guides.
No worries, agree there completely.
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#139
HD64G
I tend to believe that leaks of 12400 beating 5600X is from shills testing with the broken for AMD scheduler. Intel will try hard to get many preorders before the official launch and the reviews from the proven to be independent tech sites either way.
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#140
micropage7
somehow i still believe that there's unwritten relation that windows will act much better on intel based than AMD, maybe this time too
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#141
Vayra86
zlobbyImagine if we had a perfectly working software from even its first build? While this can work only on a theoretical level that has no practical use to us, I continue to hate M$ for their cheap and sloppy implementation of pretty much everything that they make.

I mean, nobody is perfect but does this mean that they should be THAT sloppy? Sadly, yes. And the root cause is that apart from a few (relative to numbers in the entire user base) geeks in the forums, Joe and Jane have zero clue what a cache is, let alone what $L3 is, or God forbid - that it's botched by M$. Regular folks are force fed whatever dung-ridden software M$ decide to, sadly not too tech-savvy to realize it.
The only OS that doesnt force feed the way it works is built for advanced users only. Its called Linux.

Its a choice of evils... if you are casual user you get force fed. If you're not you spend a lot of time avoiding those meals.

Its the same as going for McDonalds or cooking your own meals.
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